Comorbidities influencing cough in idiopathic pulmonary fibrosis (IPF)
| Comorbidity | Frequency in IPF (%) | Reference(s) |
| GORD | 21–94 | [36–38] |
| OSA | 59–88# | [38–40] |
| Emphysema | 30–55 | [41] |
| ACE inhibitor use | 9–15 | [5, 42] |
| Chronic sinusitis/UACS | 17–34 | [5, 42, 43] |
| Lung cancer | 4.4–16 | [41, 44] |
| Infection | 11–20 | [3] |
GORD: gastro-oesophageal reflux disease; OSA: obstructive sleep apnoea; ACE: angiotensin converting enzyme; UACS: upper airway cough syndrome. #: with high mean body mass index of 28–32 kg·m−2.